emc software and analysis update
DESCRIPTION
EMC Software and analysis update. Update on EMC News from last run Calibrations Status of data analysis Software update Offline software Online software Task list and service work. What worked during the last run. Towers About 100/2400 dead or noisy - PowerPoint PPT PresentationTRANSCRIPT
Alexandre A. P. Suaide
Slide 1STAR Collab. Meeting, E. Lansing, Aug 2003
EMC Software and analysis updateEMC Software and analysis update
• Update on EMC– News from
last run– Calibrations– Status of data
analysis• Software update
– Offline software
– Online software
– Task list and service work
Alexandre A. P. Suaide
Slide 2STAR Collab. Meeting, E. Lansing, Aug 2003
What worked during the last runWhat worked during the last run
• Towers– About 100/2400 dead or
noisy• 1 bad digitizer board
(32) channels (replaced)• 68 noisy/dead channels• HV is set to zero for all
of them
• SMD– 3/60 modules not
working– Some individual
channels• Some we know are dead
– Zero pedestal and no readout
• Some are noisy
Alexandre A. P. Suaide
Slide 3STAR Collab. Meeting, E. Lansing, Aug 2003
Bad runs/daysBad runs/days
• About 138 bad runs– Thanks to Weijiang Dong– List at ~suaide/badruns/2003.h
Weijiang Dong
Alexandre A. P. Suaide
Slide 4STAR Collab. Meeting, E. Lansing, Aug 2003
NoiseNoise• There is a correlated noise between towers very common to
calorimeters– Pedestal distribution has a width ob ~25 GeV that can be easly reduced to ~5-6 GeV using standard comon noise subtraction methods
• The Energy dynamic range of EMC is 2400 towers*60 GeV = 144 TeV– Noise at 1:104 level
S. Trentalange
Alexandre A. P. Suaide
Slide 5STAR Collab. Meeting, E. Lansing, Aug 2003
BEMC Calibration BEMC Calibration
• Detector is calibrated using MIP peak method– Electron calibration
is under way
Alexandre A. P. Suaide
Slide 6STAR Collab. Meeting, E. Lansing, Aug 2003
ET measurement in Au+Au collisionsET measurement in Au+Au collisions
• Paper (PRC) being reviewed in the high-pT PWG
M. M. de Moura
Alexandre A. P. Suaide
Slide 7STAR Collab. Meeting, E. Lansing, Aug 2003
Electron identification in d+AuElectron identification in d+Au
• Use TPC dE/dX to pre-select electrons in the range of 1.5 < p < 5.0 GeV/c (can extend a little more)
• Compare TPC momentum with tower energy (p/Etower)
p/Etower p/Etower
dis
tan
ce
Distance < 0.015
Alexandre A. P. Suaide
Slide 8STAR Collab. Meeting, E. Lansing, Aug 2003
Comparison with Au+AuComparison with Au+Au• Electron peak is wider than Au+Au
– Lower multiplicity in d+Au makes tower equalization more difficult -> working on it
• Current tower resolution ~ 21%/sqrt(E)
d+Au
p/Etower
Alexandre A. P. Suaide
Slide 9STAR Collab. Meeting, E. Lansing, Aug 2003
The SMD can enhance e/h discriminationThe SMD can enhance e/h discrimination
• SMD can help to discriminate electrons from hadrons– Most of hadrons do not have SMD clusters– The distance between SMD and track has different
distributions
Hadroncandidates
Electron candidates
Distance SMD-track
NO SMD
SMD-
SMD-
BOTH
type
Alexandre A. P. Suaide
Slide 10STAR Collab. Meeting, E. Lansing, Aug 2003
Preliminary single electron spectra for d+Au collisionsPreliminary single electron spectra for d+Au collisions
• 950 k High-tower events
• No corrections applied– Trigger bias– Efficiency– background – Momentum
resolution, etc• Need to tune up
electron identification with EMC
(e+ + e- )/2
pT (GeV/c)
Single electron spectrum for HT d+Au collisions
HT1HT2
Alexandre A. P. Suaide
Slide 11STAR Collab. Meeting, E. Lansing, Aug 2003
0 mass reconstruction in d+Au0 mass reconstruction in d+Au S. Trentalangeand S. Guertin
Alexandre A. P. Suaide
Slide 12STAR Collab. Meeting, E. Lansing, Aug 2003
0 reconstruction in d+Au – SMD information0 reconstruction in d+Au – SMD information
• SMD is used to get the photon position– Need to understand
efficiencies– Look how many EMC
points at given energy have SMD info on it
– Efficiency drops at lower energies because SMD thresholds are very high at reconstruction software
• Need tune up
S. Trentalangeand S. Guertin
Alexandre A. P. Suaide
Slide 13STAR Collab. Meeting, E. Lansing, Aug 2003
0 spectrum in d+Au 0 spectrum in d+Au
• Much work to be done– Efficiency
corrections (embedding)
– Cluster thresholds
• This may have huge difference at high-pt because of the very small opening angle between photons
S. Trentalangeand S. Guertin
Alexandre A. P. Suaide
Slide 14STAR Collab. Meeting, E. Lansing, Aug 2003
High tower azimuthal correlationsHigh tower azimuthal correlations
• Most of high tower triggered events with no tracks pointing to the tower come from 0´s– HT-track correlations
and HT-HT correlations is a good way to study 0-track and 0-0 correlations
• It is possible to go very high in pT because of trigger
• Very preliminary work. Need to compare to minimum bias
S. Chattopadhyay, S. Voloshinand A. Suaide
trackpT
Alexandre A. P. Suaide
Slide 15STAR Collab. Meeting, E. Lansing, Aug 2003
EMC Software statusEMC Software status
• Offline reconstruction chain is fully implemented
Alexandre A. P. Suaide
Slide 16STAR Collab. Meeting, E. Lansing, Aug 2003
EMC DatabaseEMC Database
• Calibration and pedestals are filled in the database– Only MIP calibration for a while– Pedestals were saved every 12 hours during
beam time
• Status tables– Only one table with the bad towers/SMD
channels in the beggining of the run– Bad runs at ~suaide/badruns/2003.h
Alexandre A. P. Suaide
Slide 17STAR Collab. Meeting, E. Lansing, Aug 2003
EMC simulations and embeddingEMC simulations and embedding
• Slow simulator (PLEASE USE ONLY Y2003a GEOMETRY)– Real gains, pedestal
and map of dead channels from database
– Geometry propagation to .geant.root -> Is there any hope???
• Embedding (2 steps)– TPC embedding– EMC embedding
Alexandre A. P. Suaide
Slide 18STAR Collab. Meeting, E. Lansing, Aug 2003
Online software – preparation for next runOnline software – preparation for next run
• Online calibration and pedestal measurement– Software is ready – Pedestal measurement,
tower equalization and MIP calibration with L3 tracks
• Need to tune up parameters – Multiplicity cuts, time interval for pedestal
calculation
• Event display– Ready to go
• Online monitoring– EMC Monitoring – ready– STAR online monitoring (Panitkin’s) – ready– Need to check for possible changes in the
trigger map and event pool library
Alexandre A. P. Suaide
Slide 19STAR Collab. Meeting, E. Lansing, Aug 2003
Software summary – task list and service workSoftware summary – task list and service work• Simulations
– Trigger simulator (very high priority)• Implementation of current High Tower and Patch
algorithms – Signed but nothing has been done. NEED PEOPLE???
– Slow simulator (moderate priority)• Include simulation of correlated noise
– Signed but nothing has been done. NEED PEOPLE???
– Embedding• Turn on EMC real data processing (very high
priority)– Signed. Small problem with timestamp. Working on
a solution
• Test StEmcMixerMaker (very high priority)– DONE with simulation alone. Need to wait for
previous item to be fixed
Alexandre A. P. Suaide
Slide 20STAR Collab. Meeting, E. Lansing, Aug 2003
Software summary – task list and service work (cont.)Software summary – task list and service work (cont.)
• Calibration– Electron calibration (very high priority)
• Under way. Working on better tower equalization– SMD calibration
• NEED PEOPLE HERE• Database
– Status tables (extremely high priority)• Map dead/bad towers and SMD channels• Time dependence of bad channels• NEED PEOPLE HERE
• Online Software – Check software for next run (moderate
priority)• Recompile with newer libraries• Check for possible changes in the event pool library
and possible changes in the trigger maps• NEED PEOPLE HERE
Alexandre A. P. Suaide
Slide 21STAR Collab. Meeting, E. Lansing, Aug 2003
Final commentsFinal comments
• Data analysis is progressing very well (QM2004????)– ET paper being reviewed in the high-pT PWG
– Single electron spectrum– 0 spectrum and correlations
• Software development– All pieces in place– Task list
• Offline -> Simulations, embedding, map dead channels, etc.
• Online -> Need to prepare for next run• NEED VOLUNTEERS THAT ARE REALLY COMMITED
TO HELP